Grinding-machine.



G. & JQ HOLLAND-LEM.

` .GRINDING MAGHINE. APPLIOATIUN FILED 11017.18, 1911.

Patented Nov. 4, 1913.

3 SHEETS-SHEET 1.

G. '& J. HOLLAND-LEITZ.

GRINDING MACHINE.

APPLIOATION FILED 11017.18, 1911.

Patented Nov. 4, 1913.

3 SHEETS-SHEET 2.

G. & J. HOLLAND-LEITZ. GRINDING MACHINE.

APPLICATION FILED Nov. 1a, 1911.

1,077,714.' Patented Nov.4,1913.

3 SHEETS-SHEET 3.

w-foNiTED sTATEs PATENT OEEIOE.

GRINDING-MACHINE.

Specification of Letters Patent.

n Patented Nov. 4,1913.

, l yapplication mea'mvember 1s, 1911. serial No. 661,052.

T o all whom it may concern:

Be it known that' we, GEORGE HOLLAND- Ls'rz and JOHN HOLnxNn-Llz'rz, citizens of the United States, and resident-s of Crown Point, in the county of Lake and State of Indiana, have invented certain new and useful Improvement-s in Grinding-Machines, of which the following is a full, clear, and exact specification.

Our invention is concerned with grinders for the general use of farmers and eattle and swine feeders, and is designed to produce a machine that shall be capable of effectively grinding such diverse .articles as snapped corn, including the cobs and husks, and all small grains, and which shall' also -be capable of grinding alfalfa after it is cut into one-inch lengths.

To'this end, our invention is embodied in certain novel combinations of elements, which will be fully described in connection with the complete apparatus in the body of the mecification, and the novel features and combinations particularly pointed out in the claims.

To illustrate our invention, we annex hereto three sheets of drawings, in which the same reference characters are used to designate identical parts in all the figures, of which,

Figure 1 is a top plan view of the complete machine with the hopper removed and the legs broken away; Fig. 2 is a central longitudinal section on the line A-A of F ig. 1; Fig. 3 is an end elevation as seen lon the line B-B of Fig. 2, but with the stationary bur and the two swiveled bursupporting rings removed; Figs. 4 and 5 are views in front and rear elevation, respectively, of the knuckle ring which is swiveled in the back of the bur casing, together 'with a stationary bur-holding ring, which in turn is swiveled in the knuckle ring; Fig. 6 is an end elevation of the auger, on an enlarged scale, as it would appearfrom the line C-C of Fig. 2; while Fig. 7 is a similar view as it would appear from line D--D of -the same figure; Fig. 8 is an end elevation, on the same scale as Figs. 6 and 7, of the shaft with the spiral ribs thereon, as the same would appear in section on the line C-C of Fig. 2 looking toward the fly wheel; Fig. 9 is a section on the line-` E--E of Fig. 2; Fig.

10 is a section on the line F-F of Fig. 1;.

Fig. 11 is a sect-ionen the une G G of Fig. 10; Fig. 12 is a front elevation of one of the burs; Fig. 13 is a top view of the auger as seen in Fig. 7; and Fig.r 14 is a side view of it in the same position.

The upper inner surface of the main cast-- ing 20 of the -machine forms the concave 21, and said casting has the flat edges provided with apertures 22 through which bolts are passed to secure the customary hopper 23 in osition, as is indicated in Fig. 9. The castlng 20 has four inclined, downwardly-projecting socket brackets 24, which are provided with bolt holes through which bolts are passed to secure the legs 25 in the customary manner. These legs may be braced as may be desired to increase the rigidity of the structure. The casting 20 has bolted thereon the bearing 26, in which the shaft 27 is journaled, said shaft also being journaled in bearings 28 and 29 at the other end thereof, the details of which bearings will be described farther on. The concave surface 21 of the casting 20 is provided with spiral ribs 30, which coperate with spiral ribs 31formed on the sleeves 32 secured on the shaft 27 in the following manner: The outermost sleeve 32 is pinned on the shaft 27 at 33, while the adjacent ends of the two sleeves are provided with the interlocking offset 34. The adjacent ends of the innermost sleeve 32 and of the auger 35 are provided with the interlocking offset 36, while the supporting disk 37 of the rotatin bur 38 has the set screw 39l passed throng the hub thereof to engage the shaft 27. l'Vhen the parts are assembled, as many washers 40 are`interposed between the hub of the supporting disk 37 and the auger 35 as may be necessary to clamp the Various elements strung on the shaft between the hub of the disk-37 and the outermost sleeve 32 as securely as may be desired. The outer l which forms the back of the bur casing has toward its center two concentric flanges 48 and 49 which form an .annular channel adapted to receive the coperating annular flange 50 projecting from the rear of the stationary bur-holder ring 51, which is swiveled in the knuckle ring 47 by means of bolts 52 passed through supporting lugs 53 on the ring 47 and registering lugs 54 on the ring 51. The stationary bur 55, best shown in Fig. 12, is bolted to the outer face of the ring 51, and it will thus be seen that by means of the two swiveled rings, this bur, while prevented from rotating, is free to yield to a limited extent in any direction, as 1s necessary for satisfactory grinding. The flange 50 on the ring 51 does not tit tightly into the channel between the anges 48 and 49 on the back 43 of the bur casing, and we provide the packing 56, which may consist of hemp, to prevent any possible leakage of the grain to the back of the bur 55. The casting 43 has within the iange 49 a semiannular portion 57 which extends into the hub of the auger 35, but the corresponding space on the lower half of the casting 43 is open, except as it may be closed by the slide 58 to regulate the size of the aperture between the concave and the bur casing,

through which aperture the grain is carried by the auger 35. This plate 58 is provided with the ange 59 at the end for convenience in manipulating it, and it has the slot 60 therein in register with the slot 61 in the bracketj62 projecting from the bottom of the casting 43. A bolt 96 and wing nut 97 passing through these apertures enables me to adjust the plate 58 in any desired vertical position. The upper end of the plate 58 is provided with a semicircular recess of the same radius as the radius of the hub of the auger 35, so that the aperture can be substantially entirely closed, or opened to any desired extent by adjusting the plate 58. This adjustment, of course, will vary with the material being ground, the finer the material, the smaller the aperture.

As will be best seen in Fig. 9, the material in the hopper will, by the clockwise rotation of the shaft 27, be engaged by the helical ribs 31 and carried over the helical ribs 32, the shape of the casting'. being such that the space is diminished in the direction of rotation, thus bringing the two sets of ribs close together before the material escapes from them, thus insuring the cobs, if it is corn that is being ground, being thoroughly broken up. To prevent the possibility of the husks winding upon the ribs 31, we provide the knife 98, which is bolted on the iiange 63 formed on the upper surface of the casting 20 in position so almost touched by the edges of the helical ribs 31 as they rotate past the knife. The auger 35 is provided on its outer end with that the edge of the Jknife is two pairs of lugs, the lugs 64 being longer and thinner than the lugs 65, the base of the lugs 64 being in the form of a short helix, while thefbases of the lugs 65 are substantially of the form of a right-angled triangle. The direct-ion of rotation 0f the shaft is such that all four of these lugs present helically located surfaces tending to force the grain through the aperture between the concave and the bur casing.

The supporting disk 37 has secured thereon the bur 38, which is shaped just like the bur 55, shown in Fig. 12, so that the teeth 66 on the two burs project in the opposite directions.' The surfaces of the burs are provided with grinding corrugat-ions '67, and the teeth 66 of the stationary bur approach very close to the reduced outer ends of the ribs 68 formed on the truncated conical `surface 69 of the auger 35. These ribs 68 serve to direct the grain between the burs 38 and 55, and the coperation of the ribs G8` with the teeth 66 of the'bur 55 serves to further break up the materials at this point, if such action is needed prior to their being ground between the burs. 1t will, of course, be understood that these burs ccoperate in the customary manner, grinding the material as it passes between them and is discharged through the aperture 70 formed in the front 71 of the bur casing. This front 71 is of the concave shape shown, and is provided with lugs 72 through which bolts are passed to secure the two parts of the' bur casing together.

The hearing 28V is self-centering in its action, and to permit of the necessary movement to secure this effect` it is mounted in the following manner: As best seen in Figs. 1, 10 and 11, the concave portion 71 of the bur casing has bolted to its outer surface the semiannular casting 73, which is provided with arms 74 and 75 extending parallel to the direct-ion of the sha-ft. The arms 74 and 75 are preferably semiannular in cross section, and the arm 75 has a-"lug 76 formed thereon and adaptedi'to coperate with the recess 77 formedv in the bearings 28. Difametrically opposed to this recess 77 is an elongated recess 78 in the bearing, and coperating with this recess "(8 is the point of the screw 79, which is threaded through the arm 74 and has the lock-nut 80 thereon to secure the screw in any dcsired position of adjustment. Thisv swiveling connect-ion between the arms 74 and 75 and the bearing 28 'enables the latter to swing as much as `may be necessary to keep the shaft. 27 automatically centered o-r selfalined for grinding purposes, and it, together withithe corresponding and coperating self-alining action of the stationary bur secured by the described meeting thereof, overcomes all the ditliculty which would otherwise occur due to the burs getting out of alinement when the shaft' is vibrating. This vibra-tion is due to the pressure of the material being ground, and if the stationary bur and shaft. are not self-alining, small grains would pass between the burs with' out being ground. f

The Vend-thrust bearing 29 is of the shape best shown in cross section in Fig. 2, where it will be seen that the end of thesha-ft 27 extends into the babbitted portion 81, which portion rests against the annular offset 82. A hardened metal disk 83 bears against the end of the shaft 27 and extends into the reduced portion 84 of the recess in the bearing, and contacts with the metal ball 85, which in turn engaes the hardened metal disk 86 in the end o, the recess. This, when properly lubricated, forms a ver' desirable end-thrust bearin which' is he d in position in any desire adjustment by means of the arm 87 pivoted at 88 to the arm 74, and having a rib 89 entering the recess 90 in the end of the bearing- 29. The outer endv of the arm 87 is perforated, and' the hook link 91, the end of which is hooked in the end of the arm 75, passes through the perforation, and the nut 92 andlock nut 93 threaded on the endof the hook serve to adjust the position of the end bearing as may be desired. To permit the shaft to yield outwardly against some severe' stress,l as if a piece of metal or hard rock should get betweenthe burs, we interpose between the nut 92-and the end of the arm 87 the helica-lly-coiled expanding-spring 94, which surrounds the link 91 and is sufficiently stiif so that it yields onlyvunder exceptional pressure, and does not interfere with the grinding. To further permit-yielding of the shaft in case of extreme stress, we make the pin 88 of wood, so that it can be sheared of by any unusual strain withoutbreaking the castings. To lubricate these horizontal 'bearings 26, 28 and 29. we provide each of them withl al cup 95, 'which is adapted to contain hard grease that will not drip out of the horizonta; bearings as would ordinary lubricating o1 The operation of the complete apparatus will now be readily apparent, as it will be seen that the preliminary crushing is done in the concave, after which the crushed ma.- terial is passed into the bur casing, where it is ground to the desired degree of fineness between the two burs. `tfIt will be understood, of course, that the degree of fineness is regulated by adjusting the nuts 92 and 93 on the link 91.

While we have shown. and described our invention as embodied y'1n/'the form which we at present consider best. adapted to carry out its purposes, it will'be' understood that it is capable of some modifications, and that we do not desire to be limited in the interpretation of the following claims except as may be necessitated by the state of the prior art. .i i

What we claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a grinding machine, the combination with a cc-ncaveof a bur casing at one end thereof, a shaft extending through said concave and casing, crushing cylinders on the shaft above the concave, a bur secured to the shaft within the casing, a stationaryV bur secured to the bur casing, an augersecured on the sha-ft to force'the crushed materia] from theeoncave into the bur casing and between the burs, said auger having two sets of projections on opposite sides of a central `plain annular space with the bur casing fitting on one side o-f said annular space, and a plate movable to and from the other side of said annular space of the auger to determine the effective sizeof the passage between'the concave andthe casing.

2. In a grinding machine, the combination' with a concave, of a bur-casing at one end thereof, a shaft extending through said concave' and casing, crushing cylinders on the sha-ft above t-heconcave, a bur secured to the shaft within thel casing and having inwardly extending teeth, a stationary bur. secured to the bur casing, and an auger having a conical portion secured on the shaft to force the crushedu material from the concave into the bur-casing and having ribs thereon following the general outline of the conical portion of the auger and tapering toward the rotating bur and rotating adjacent the points of the teeth on the stationary bur.

3. In a grinding machine, the combinationI with a bur casing, of burs suitably supported therein, a shaft extending through the bur casing, a bur secured to the shaft, arms extending from the bur casing, a bearing sleeve for the shaft between said arms, a lug on one arm coperating with the recess in the,

sleeve, and a set screw in the other arm cooperating wit-h an elongated recess in the opposite side of the sleeve from the first recess.

4. In a grinding machine, the combination with a bur-casing cover, of a pair of arms secured thereto and extending generally parallel to the shaft and near thereto at their inner ends, a bearing sleeve extending between the arms and yieldingly supported therefrom, a lever pivoted in the end of one of the arms and having an aperture at its free end, a bolt connected tothe end of the other arm and extending through said aperture, a set nut on the bolt,;;a spring between the setv nut and lever, a shaftjournaled in the sleeve, and an end-thrust bearing for the shaft engaged by the lever.

5. In a grinding machine, a stationary',

flanges toward the center of the same side to form an annular channel adapted to receive packing, and recesses at the edges thereof for passing bolts therethrough to secure a stationary cover thereon.

6. In a grinding machine, a stationary bur-casing member consisting of a disk having a peri heral flange with diametrically opposed o sets forming recesses in the flange, together with two concentric flanges toward the center of the same side to form an annular channel adapted to receive packing, and recesses at the edges thereof for passing bolts therethrough to secure a stationary cover thereon.

7. In a grinding machine, an auger having a cylindrical portion with lugs extending substantially to the inner end of the cylindrical portion, and a conical portion with lugs thereon extending substantially to the plane of the adjacent ends of the other set of lugs in combination with a stationary bur having a central aperture into which the conical portion of the auger enters.

8. In a grinding machine, an auger having a cylindrical portion with four lugs extending in a generally helical direction substantially to the inner en-d of the cylindrical portion, and a conical portion with two lugs thereon extending substantially to the plane of the adjacent ends of the four lugs, in combination with a stationary bur having a central aperture into which the conical portion of the auger enters.

9. In a grinding machine, the combination with a bur casing, of a shaft journaled therein, a stationary bur with inwardly projecting teeth, an auger secured on the shaft having a cylindrical portion with lugs eX- tending substantially to the inner end of the cylindrical portion, and a conical portion with lugs thereon extending substantially to the plane of the adjacent ends of the other lugs and coperating with the projecting teeth of the bur, in combination with a stationary bur having a central aperture into which the conical portion of the auger cnters. A

10. In a grinding machine, a bearing castingy having a semi-annular body portion, a palr of arms projecting at right angles thereto, with an` ear at the end of one arm, a recess for a hookat the end of the other arm, and a semi-annular rib connecting the ends of the two arms.

In witness whereof, we have hereunto set our hands, and alixed our seals, this tenth day of November, A. D. 1911.

GEORGE HOLLAND-LETZ. JOHN HOLLAND-LEITZ.

[L e] [1.. s.]

Copies of this patent may be obtained for ve cents each, by addressing. the Commissioner of Patents, Washington` D. C. 

